Which statement is most correct?
A. Electric currents and magnets each exert a force.
B. Electric currents exert a force but magnets do not.
C. Neither an electric current nor a magnet exert a force.
D. Electric currents do not exert a force but magnets do exert a force.
Answer: A
Explanation:
A brick has a mass of and the Earth has a mass of . Use this information to answer the questions below. Be sure your answers have the correct number of significant digits. What is the mass of 1 mole of bricks? Round your answer to 2 significant digits. How many moles of bricks have a mass equal to the mass of the Earth? Round your answer to 2 significant digits.
The given question is incomplete. The complete question is:
A brick has a mass of 4.0 kg and the earth has a mass of [tex]6.0\times 10^{27}g[/tex] Use this information to answer the questions below. Be sure your answers have the correct number of significant digits. What is the mass of 1 mole of bricks? Round your answer to 2 significant digits. How many moles of bricks have a mass equal to the mass of the Earth? Round your answer to 2 significant digits.
Answer: The mass of 1 mole of bricks is [tex]2.4\times 10^{27}g[/tex]
2.5 moles of bricks have a mass equal to the mass of the Earth
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
Mass of 1 brick = 4.0 kg = 4000 g (1kg=1000g)
Thus mass of 1 mole of brick or [tex]6.023\times 10^{23}[/tex] bricks will be = [tex]\frac{4000g}{1}\times 6.023\times 10^{23}=2.4\times 10^{27}g[/tex]
The mass of 1 mole of bricks is [tex]2.4\times 10^{27}g[/tex]
Now [tex]2.4\times 10^{27}g[/tex] will correspond to = 1 mole of bricks
[tex]6.0\times 10^{27}g[/tex] will correspond to =[tex]\frac{1}{2.4\times 10^{27}}\times 6.0\times 10^{27}=2.5moles[/tex]
2.5 moles of bricks have a mass equal to the mass of the Earth
If you are given 720.00 Grams of Oxygen how many moles of Oxygen will you have?
Answer:
720 divided by 2 answer is 556 so answer per is 3.32.3
Explanation:
Why is the age of the ocean crust used as evidence for plate tectonics?
Answer:
The great age of continental rocks results from their inability to be subducted. ... We also know that the increase in age of ocean crust away from ocean basins results from creation of new sea floor at the MORs, with destruction of older sea floor at ocean trenches, which are often located near continental margins.
Explanation:
The age of the ocean crust used as evidence for plate tectonics because older ocean crust is being melted back into the mantle at divergent boundaries.Older ocean crust is being melted back into the mantle at divergent boundaries. Therefore, option A is correct.
Why plate tectonics is a theory?Plate tectonics is a theory because it supplies an explanation of why and how segments of the earth displace and make earthquakes and mountains and volcanos.
This states why ocean floor rocks are generally less than 200 million years old whereas the oldest continental rocks are more than 4 billion years old.
The great age of continental rocks effects from their inability to be subducted. We also know that the addition in age of ocean crust away from ocean basins results from activity of new sea floor at the MORs, with destruction of older sea floor at ocean trenches.
Thus, option A is correct.
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Your question is incomplete, most probably your question was
Why is the age of the ocean crust used as evidence for plate tectonics?
A Older ocean crust is being melted back into the mantle at divergent boundaries.Older ocean crust is being melted back into the mantle at divergent boundaries.
B There are striations on the ocean crust where the continental crust moved over the top of it.There are striations on the ocean crust where the continental crust moved over the , top of it.
C Ocean crust is older than continental crust so it shows that the continents are younger.Ocean crust is older than continental crust so it shows that the continents are , younger.
D New ocean crust is being formed at underwater divergent boundaries pushing away older crust.
A bronze bell containing copper and tin is
a. pure substance
b. colloidal suspension
c. a solid solution
d. heterogenous mixture
Answer:
I will go for a heterogeneous mixture
Explanation:
alloy is basically a mixture
Calculate the volume of 5.0 grams of NO gas at STP.
Answer:
The volume of 5.0 g CO 2 is 2.6 L CO 2 at STP
Explanation:
STP
STP is currently
0
∘
C
or
273.15 K
, which are equal, though the Kelvin temperature scale is used for gas laws; and pressure is
10
5
.
Pascals (Pa)
, but most people use
100 kPa
, which is equal to
10
5
.
Pa
.
You will use the ideal gas law to answer this question. Its formula is:
P
V
=
n
R
T
,
where
P
is pressure,
V
is volume,
n
is moles,
R
is a gas constant, and
T
is temperature in Kelvins.
Determine moles
You may have noticed that the equation requires moles
(
n
)
, but you have been given the mass of
CO
2
. To determine moles, you multiply the given mass by the inverse of the molar mass of
CO
2
, which is
44.009 g/mol
.
5.0
g CO
2
×
1
mol CO
2
44.009
g CO
2
=
0.1136 mol CO
2
Organize your data
.
Given/Known
P
=
100 kPa
n
=
0.1136 mol
R
=
8.3145 L kPa K
−
1
mol
−
1
https://en.wikipedia.org/wiki/Gas_constant
T
=
273.15 K
Unknown:
V
Solve for volume using the ideal gas law.
Rearrange the formula to isolate
V
. Insert your data into the equation and solve.
V
=
n
R
T
P
V
=
0.1136
mol
×
8.3145
.
L
kPa
K
−
1
mol
−
1
×
273.15
K
100
kPa
=
2.6 L CO
2
rounded to two significant figures due to
5.0 g
Answer link
Doc048
May 18, 2017
I got 2.55 Liters
Explanation:
1 mole of any gas at STP = 22.4 Liters
5
g
C
O
2
(
g
)
=
5
g
44
(
g
mole
)
=
0.114
mole
C
O
2
(
g
)
Volume of 0.114 mole
C
O
2
(
g
)
= (0.114 mole)(22.4 L/mole) = 2.55 Liters
C
O
2
(g) at STP
5. Based on Reference Table F, which of the following saturated solutions would be the least concentrated?
1) copper (II) sulfate 2) barium sulfate
3) sodium sulfate 4) potassium sulfate
Answer:
barium sulfate
Explanation:
Why does CH4 have a higher vapor pressure at a given temperature than CH3Cl? Why does CH3OH have a higher vapor pressure at a given temperature than CH3CH2CH2OH? Why does H2CO have a higher vapor pressure at a given temperature than CH3OH?
Explanation:
CH4, methane is a non polar compound whereas CH3Cl is a polar compound because of presence of electronegative element chlorine. Hence, there is a net dipole moment in case of CH3Cl( Chloromethane). This causes CH3Cl to exhibits dipole-dipole intermolecular force of attraction, which is absent in CH4. Therefore, Chloromethane has a lower vapor pressure when compared to methane.
Which statement best describes why modern horses look the way they do?
Aspects of horse anatomy evolved within a few generations to suit their environment.
Aspects of horse anatomy evolved over hundreds of years to suit their environment
Aspects of horse anatomy evolved over millions of years to suit their environment.
Aspects of horse anatomy evolved within a generation to suit their environment.
Answer:
C
Explanation:
C
Aspects of horse anatomy evolved over millions of years to suit their
environment.
EvolutionEvolution refers to the various ways and forms organisms developed
throughout the years. This is usually as a result of their adaptation to
different living conditions.
Horses were believed to be similar to dogs millions of years ago according
to discovered fossils but became taller as a result of their adaptation to the
plains which they now lived in.
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How many total atoms are in this chemical formula?
6H3PO4
Explanation:
total atoms = 18 + 6 + 24= 48 atoms
What do producers, consumers, and decomposers all have in common?
A. They only exist on land.
B. They are all the same type of organism.
C. They only live in ecosystems with warm temperatures.
D. They rely on abiotic components of ecosystems to live.
Can someone pls tell me if this is right?
Answer:
wrong it is hydrogen is more electronegative
you are welcome
Engineers Julie and Walter operate a reactor where two unbalanced, gas phase reactions occur: CH3COOH+H2→C2H5OH+H2O and C2H5OH→(C2H5)2O+H2O. In the first reaction, acetic acid (CH3COOH) and hydrogen (H2) react to produce ethanol (C2H5OH) and water (H2O); and ethanol decomposes to diethyl ether ((C2H5)2O) and water in the second reaction. A stream of 67.8 mol/s hydrogen and the balance acetic acid at 147°C is fed to the reactor, which operates at steady state. The stream exiting the reactor contains acetic acid, hydrogen, ethanol, water, and diethyl ether at 417°C. The component flow rate of acetic acid exiting the reactor is 3.81 mol/s. The fraction conversion of acetic acid is 71.6%, and the selectivity, which is the ratio of the amount of ethanol to diethyl ether in the exiting stream, is 3.14. Assume all components are in the gas phase and no phase changes occur in the reactor.
Find the component molar flow rate of acetic acid(AA) entering the reactor.
Answer:
Explanation:
From the given information:
The two reactions occurring in the reactor are:
[tex]\mathtt{CH_3COOH + 2H_2 \to C_2H_5OH + H_2O}[/tex]
[tex]\mathtt{2C_2H_5OH \to (C_2H_5)_2O+H_2O}[/tex]
Let molar flowrate of [tex]\mathtt{CH_3COOH}[/tex] entering reactor = [tex]\mathtt{x_n}[/tex]
From the first reaction:
[tex]\mathtt{CH_3COOH + 2H_2 \to C_2H_5OH + H_2O}[/tex]
Since there is a 71.6% conversion of [tex]\mathtt{CH_3COOH}[/tex];
Then, amount of [tex]\mathtt{CH_3COOH}[/tex] remaining unreacted and exiting the reactor is:
= x - 0.716x
= 0.284x
Recall that; the component flow rate exiting the reactor = 3.81 mols
∴
0.284x = 3.81
x = 3.81/0.284
x = 13.42 moles
Thus, the molar flowrate of [tex]\mathtt{CH_3COOH}[/tex] entering the reactor is 13.42 moles
You add 0.500 moles of an alcohol to 500 gram of water. The molality of your solution is?
If the amount of dissolved solute in a solution at a given temperature is greater than the amount that can permanently remain in the solution at that temperature, the solution is said to be
a. diluted.
b. unsaturated.
c. saturated.
d. supersaturated.
that temperature is saturated.
Compound A has 4 moles of hydrogen, 4 moles of oxygen, and
1 moles of silicon. The empirical formula of the compound is???
In H4SiO4, the mole ratio of carbon to hydrogen to oxygen is the same as described in the question. Therefore H4SiO4 is the empirical formula
I hope this helps you!!
Whats the atomic number for protactinium-231
Answer:
91
Fact box
Group Actinides 1572°C, 2862°F, 1845 K
Block f 15.4
Atomic number 91 231.036
State at 20°C Solid 231Pa
Electron configuration [Rn] 5f26d17s2 7440-13-3
Explanation:
the reaction that takes place in chemical cell is best classified as. A.fusion B.redox C.transmutation D.redox
The reaction in the chemical cell has been best classified as the redox reaction. Thus, option B is correct.
The reaction cell or the voltaic cell has been the one that has been able to convert electrical energy into chemical energy. In the chemical cell, electrical energy has been provided to the cell for bringing the chemical change.
The chemical change has been brought by the oxidation and reduction of the elements with the application of electric current. The reaction that has been based on the oxidation and reduction of the elements has been termed the redox reaction.
Thus, the reaction in the chemical cell has been best classified as the redox reaction. Thus, option B is correct.
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Some one plz help me
Answer:
it is letter c
Explanation:
the thing is the thing i need pionts
Answer:
b
Explanation:
I think the answer is b mmmmmmmmmm
2 C4H10 + 13 O2 ---> 8 CO2 + 10 H2O 4. You have 35.25 L of C4H10 what is the theoretical yield in grams of carbon dioxide?
Answer:
277.0g of CO₂ is theoretical yield
Explanation:
In the reaction, 2 moles of C₄H₁₀ react with 8 moles of CO₂.
To solve this question, we must convert the volume of the C₄H₁₀to moles. Then, using the chemical reaction, find the moles of CO₂ produced and its mass as follows:
PV = nRT
Assuming STP conditions:
P = 1atm
V = 35.5L
n are moles
R = 0.082atmL/molK
T = 273.15K
Replacing:
n = PV/RT
n = 1atm*35.25L / 0.082atmL/molK*273.15K
n = 1.574 moles C₄H₁₀
Assuming all these moles are converted in CO₂ (theoretical yield), the moles of carbon dioxide are:
1.574 moles C₄H₁₀ * (8mol CO₂ / 2mol C₄H₁₀) = 6.295 moles CO₂
And the theoretical yield in mass is:
6.295 moles CO₂ * (44.01g / mol) =
277.0g of CO₂ is theoretical yieldWhat is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?
__Ca + __H20 --> __Ca(OH)2 + __H2
2 Ca + 2H2O ⇒ 2 Ca(OH)2 + H2
Explanation: number of atoms of every element
Need to be equal in both sides
The right ratio of chemicals for the balanced chemical equation is 2Ca + 2H₂O ⇒ 2 Ca( OH )₂ + H₂.
What is balanced chemical equation ?A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.
Because mass cannot be generated or destroyed, according to the rule of conservation of mass, a chemical equation must always be in balance.
A chemical equation must be balanced. This is so that it can convey how many moles are reacting and creating. The amount of electrons that are transferred from one substance to another is also indicated. An equation that balances or is balanced also describes how energy is changed.
Thus, the balanced chemical equation is 2Ca + 2H₂O ⇒ 2 Ca( OH )₂ + H₂.
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What must ALWAYS be used to convert between quantities of two different chemical substances?
Answer:
Balanced equations and mole ratios
In general, mole ratios can be used to convert between amounts of any two substances involved in a chemical reaction.
Explanation:
yw
Answer:
ask your mom and your family
Explanation:
tell your mom that she sucks
Plants get all their matter from soil. True or False
Answer:
False
Explanation:
Not all of it but some of it. Hope this helps! (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧
= Br
= C
Name is
1
, formula is
Answer:
yqujsbr
Explanation:
hejsudh2ihdg4 they t sjh5c4uSvreju5 aur bd84kskythddok6vr for
Calculate the molarity of a solution of monoprotic KHP prepared by mixing a 0.5237 g KHP in 50.0 mL of water .
Answer:
[tex]M=0.0513M[/tex]
Explanation:
Hello!
In this case, since the molarity of a solution is computed by dividing the moles of solute by the volume of solution, we notice we first need the moles of KHP as shown below:
[tex]n=0.5237g*\frac{1mol}{204.22 g} =0.00256mol[/tex]
Next, the volume in liters:
[tex]V=50.0mL*\frac{1L}{1000mL}\\\\V=0.0500L[/tex]
Thus, the molarity turns out to be:
[tex]M=\frac{n}{V}\\\\M=\frac{0.00256mol}{0.05000L} \\\\M=0.0513M[/tex]
Best regards!
If the amount of dissolved solute in a solution at a given temperature is greater than the amount that can permanently remain in the solution at that temperature, the solution is said to be
a.diluted.
b.unsaturated.
c.saturated.
d.supersaturated.
Answer:
d. supersaturated.
Explanation:
A solution naturally contains a solute and a solvent. The solute is the solid substance that dissolves in the solvent, which is usually a liquid substance. A solution has a maximum amount of solute that can dissolve in its constituent solvent.
However, when the amount of dissolved solute in a solution at a given temperature is greater than the amount that can permanently remain in the solution at that temperature, the solution is said to be SUPERSATURATED. This means that the solution contains more than the maximum amount of solute.
what can determine from examining the fossil record
Answer:
Fossils are traces of organisms that lived in the past. When fossils are found, they are analyzed to determine the age of the fossil. The absolute age of the fossil can be determined through radiometric dating and determining the layer of rock in which the fossil was found.
Explanation:
a Which elements does a hydrocarbon contain?
b Calculate the empirical formulae of A and B.
c Calculate the molecular formulae of A and B.
Answer:
a. A hydrocarbon is any of a class of organic chemicals made up of only the elements carbon (C) and hydrogen (H). The carbon atoms join together to form the framework of the compound, and the hydrogen atoms attach to them in many different configurations.
Answer:
hydrocarbon means that a compound only contains carbon and hydrogen contain together to form a chain.For example
methane-CH4 Main formula CnH2n+2
ethane- C2H6 methane empirical formula CH4
propane=C3H8 Methane molecular formula CH4
ethane empirical formula - C2H6
ethane molecular formula CH3-CH3 (C2H6)
propane empirical formula C3H8
propane molecular formula CH3-CH2-CH3 (C3H8)
Explanation:
Solutions with water as the solvent are called
a.liquids.
b.electrolytic.
c.aqueous solutions.
d.miscible solutions.
Answer:
C. Aqueous Solutions
General Formulas and Concepts:
Aqueous Solutions'
DissociationSolvents and SolutionsExplanation:
Water is the universal solution that solvents are dissolved in. Whenever anything is dissolved in water, it will be an aqueous solution.
Strong ionic solutions dissolve into their ions when dissolved in water.
Weak acids and bases don't fully dissociate in water.
Explain , in terms of electrons, why the bonding in strontium sulfide , SrS , is similar to the bonding in magnesium bromide, MgBr 2,
Explanation:
The bonding in Magnesium Bromide is ionic bonding. Ionic bonding occurs between metals and non metals, due to the transfer of electrons.
Strontium Sulphide is also an ionic compound. The metal is Strontium and the non metal is sulphur.
In terms of electrons, it is similar to Magnesium bromide in the sense that the metal lost two electrons and the non metal gained two electrons which is the same as in Magnesium Bromide.